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44331fe2 AS |
1 | /* |
2 | * Copyright 2011, Siemens AG | |
3 | * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com> | |
4 | */ | |
5 | ||
6 | /* | |
7 | * Based on patches from Jon Smirl <jonsmirl@gmail.com> | |
8 | * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 | |
12 | * as published by the Free Software Foundation. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
22 | */ | |
23 | ||
24 | /* Jon's code is based on 6lowpan implementation for Contiki which is: | |
25 | * Copyright (c) 2008, Swedish Institute of Computer Science. | |
26 | * All rights reserved. | |
27 | * | |
28 | * Redistribution and use in source and binary forms, with or without | |
29 | * modification, are permitted provided that the following conditions | |
30 | * are met: | |
31 | * 1. Redistributions of source code must retain the above copyright | |
32 | * notice, this list of conditions and the following disclaimer. | |
33 | * 2. Redistributions in binary form must reproduce the above copyright | |
34 | * notice, this list of conditions and the following disclaimer in the | |
35 | * documentation and/or other materials provided with the distribution. | |
36 | * 3. Neither the name of the Institute nor the names of its contributors | |
37 | * may be used to endorse or promote products derived from this software | |
38 | * without specific prior written permission. | |
39 | * | |
40 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND | |
41 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
43 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE | |
44 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
45 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
46 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
48 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
49 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
50 | * SUCH DAMAGE. | |
51 | */ | |
52 | ||
53 | #ifndef __6LOWPAN_H__ | |
54 | #define __6LOWPAN_H__ | |
55 | ||
44331fe2 AS |
56 | #define UIP_802154_SHORTADDR_LEN 2 /* compressed ipv6 address length */ |
57 | #define UIP_IPH_LEN 40 /* ipv6 fixed header size */ | |
58 | #define UIP_PROTO_UDP 17 /* ipv6 next header value for UDP */ | |
59 | #define UIP_FRAGH_LEN 8 /* ipv6 fragment header size */ | |
60 | ||
61 | /* | |
62 | * ipv6 address based on mac | |
63 | * second bit-flip (Universe/Local) is done according RFC2464 | |
64 | */ | |
65 | #define is_addr_mac_addr_based(a, m) \ | |
66 | ((((a)->s6_addr[8]) == (((m)[0]) ^ 0x02)) && \ | |
67 | (((a)->s6_addr[9]) == (m)[1]) && \ | |
68 | (((a)->s6_addr[10]) == (m)[2]) && \ | |
69 | (((a)->s6_addr[11]) == (m)[3]) && \ | |
70 | (((a)->s6_addr[12]) == (m)[4]) && \ | |
71 | (((a)->s6_addr[13]) == (m)[5]) && \ | |
72 | (((a)->s6_addr[14]) == (m)[6]) && \ | |
73 | (((a)->s6_addr[15]) == (m)[7])) | |
74 | ||
75 | /* ipv6 address is unspecified */ | |
76 | #define is_addr_unspecified(a) \ | |
77 | ((((a)->s6_addr32[0]) == 0) && \ | |
78 | (((a)->s6_addr32[1]) == 0) && \ | |
79 | (((a)->s6_addr32[2]) == 0) && \ | |
80 | (((a)->s6_addr32[3]) == 0)) | |
81 | ||
82 | /* compare ipv6 addresses prefixes */ | |
83 | #define ipaddr_prefixcmp(addr1, addr2, length) \ | |
84 | (memcmp(addr1, addr2, length >> 3) == 0) | |
85 | ||
86 | /* local link, i.e. FE80::/10 */ | |
9026c492 | 87 | #define is_addr_link_local(a) (((a)->s6_addr16[0]) == htons(0xFE80)) |
44331fe2 AS |
88 | |
89 | /* | |
90 | * check whether we can compress the IID to 16 bits, | |
91 | * it's possible for unicast adresses with first 49 bits are zero only. | |
92 | */ | |
93 | #define lowpan_is_iid_16_bit_compressable(a) \ | |
94 | ((((a)->s6_addr16[4]) == 0) && \ | |
8d879a3f TC |
95 | (((a)->s6_addr[10]) == 0) && \ |
96 | (((a)->s6_addr[11]) == 0xff) && \ | |
97 | (((a)->s6_addr[12]) == 0xfe) && \ | |
98 | (((a)->s6_addr[13]) == 0)) | |
44331fe2 AS |
99 | |
100 | /* multicast address */ | |
101 | #define is_addr_mcast(a) (((a)->s6_addr[0]) == 0xFF) | |
102 | ||
103 | /* check whether the 112-bit gid of the multicast address is mappable to: */ | |
104 | ||
105 | /* 9 bits, for FF02::1 (all nodes) and FF02::2 (all routers) addresses only. */ | |
106 | #define lowpan_is_mcast_addr_compressable(a) \ | |
107 | ((((a)->s6_addr16[1]) == 0) && \ | |
108 | (((a)->s6_addr16[2]) == 0) && \ | |
109 | (((a)->s6_addr16[3]) == 0) && \ | |
110 | (((a)->s6_addr16[4]) == 0) && \ | |
111 | (((a)->s6_addr16[5]) == 0) && \ | |
112 | (((a)->s6_addr16[6]) == 0) && \ | |
113 | (((a)->s6_addr[14]) == 0) && \ | |
114 | ((((a)->s6_addr[15]) == 1) || (((a)->s6_addr[15]) == 2))) | |
115 | ||
116 | /* 48 bits, FFXX::00XX:XXXX:XXXX */ | |
117 | #define lowpan_is_mcast_addr_compressable48(a) \ | |
118 | ((((a)->s6_addr16[1]) == 0) && \ | |
119 | (((a)->s6_addr16[2]) == 0) && \ | |
120 | (((a)->s6_addr16[3]) == 0) && \ | |
121 | (((a)->s6_addr16[4]) == 0) && \ | |
122 | (((a)->s6_addr[10]) == 0)) | |
123 | ||
124 | /* 32 bits, FFXX::00XX:XXXX */ | |
125 | #define lowpan_is_mcast_addr_compressable32(a) \ | |
126 | ((((a)->s6_addr16[1]) == 0) && \ | |
127 | (((a)->s6_addr16[2]) == 0) && \ | |
128 | (((a)->s6_addr16[3]) == 0) && \ | |
129 | (((a)->s6_addr16[4]) == 0) && \ | |
130 | (((a)->s6_addr16[5]) == 0) && \ | |
131 | (((a)->s6_addr[12]) == 0)) | |
132 | ||
133 | /* 8 bits, FF02::00XX */ | |
134 | #define lowpan_is_mcast_addr_compressable8(a) \ | |
135 | ((((a)->s6_addr[1]) == 2) && \ | |
136 | (((a)->s6_addr16[1]) == 0) && \ | |
137 | (((a)->s6_addr16[2]) == 0) && \ | |
138 | (((a)->s6_addr16[3]) == 0) && \ | |
139 | (((a)->s6_addr16[4]) == 0) && \ | |
140 | (((a)->s6_addr16[5]) == 0) && \ | |
141 | (((a)->s6_addr16[6]) == 0) && \ | |
142 | (((a)->s6_addr[14]) == 0)) | |
143 | ||
144 | #define lowpan_is_addr_broadcast(a) \ | |
145 | ((((a)[0]) == 0xFF) && \ | |
146 | (((a)[1]) == 0xFF) && \ | |
147 | (((a)[2]) == 0xFF) && \ | |
148 | (((a)[3]) == 0xFF) && \ | |
149 | (((a)[4]) == 0xFF) && \ | |
150 | (((a)[5]) == 0xFF) && \ | |
151 | (((a)[6]) == 0xFF) && \ | |
152 | (((a)[7]) == 0xFF)) | |
153 | ||
154 | #define LOWPAN_DISPATCH_IPV6 0x41 /* 01000001 = 65 */ | |
155 | #define LOWPAN_DISPATCH_HC1 0x42 /* 01000010 = 66 */ | |
156 | #define LOWPAN_DISPATCH_IPHC 0x60 /* 011xxxxx = ... */ | |
157 | #define LOWPAN_DISPATCH_FRAG1 0xc0 /* 11000xxx */ | |
158 | #define LOWPAN_DISPATCH_FRAGN 0xe0 /* 11100xxx */ | |
159 | ||
719269af | 160 | #define LOWPAN_DISPATCH_MASK 0xf8 /* 11111000 */ |
161 | ||
162 | #define LOWPAN_FRAG_TIMEOUT (HZ * 60) /* time-out 60 sec */ | |
163 | ||
164 | #define LOWPAN_FRAG1_HEAD_SIZE 0x4 | |
165 | #define LOWPAN_FRAGN_HEAD_SIZE 0x5 | |
166 | ||
167 | /* | |
168 | * According IEEE802.15.4 standard: | |
169 | * - MTU is 127 octets | |
170 | * - maximum MHR size is 37 octets | |
171 | * - MFR size is 2 octets | |
172 | * | |
173 | * so minimal payload size that we may guarantee is: | |
174 | * MTU - MHR - MFR = 88 octets | |
175 | */ | |
176 | #define LOWPAN_FRAG_SIZE 88 | |
177 | ||
44331fe2 AS |
178 | /* |
179 | * Values of fields within the IPHC encoding first byte | |
180 | * (C stands for compressed and I for inline) | |
181 | */ | |
182 | #define LOWPAN_IPHC_TF 0x18 | |
183 | ||
184 | #define LOWPAN_IPHC_FL_C 0x10 | |
185 | #define LOWPAN_IPHC_TC_C 0x08 | |
186 | #define LOWPAN_IPHC_NH_C 0x04 | |
187 | #define LOWPAN_IPHC_TTL_1 0x01 | |
188 | #define LOWPAN_IPHC_TTL_64 0x02 | |
189 | #define LOWPAN_IPHC_TTL_255 0x03 | |
190 | #define LOWPAN_IPHC_TTL_I 0x00 | |
191 | ||
192 | ||
193 | /* Values of fields within the IPHC encoding second byte */ | |
194 | #define LOWPAN_IPHC_CID 0x80 | |
195 | ||
196 | #define LOWPAN_IPHC_SAC 0x40 | |
197 | #define LOWPAN_IPHC_SAM_00 0x00 | |
198 | #define LOWPAN_IPHC_SAM_01 0x10 | |
199 | #define LOWPAN_IPHC_SAM_10 0x20 | |
200 | #define LOWPAN_IPHC_SAM 0x30 | |
201 | ||
202 | #define LOWPAN_IPHC_SAM_BIT 4 | |
203 | ||
204 | #define LOWPAN_IPHC_M 0x08 | |
205 | #define LOWPAN_IPHC_DAC 0x04 | |
206 | #define LOWPAN_IPHC_DAM_00 0x00 | |
207 | #define LOWPAN_IPHC_DAM_01 0x01 | |
208 | #define LOWPAN_IPHC_DAM_10 0x02 | |
209 | #define LOWPAN_IPHC_DAM_11 0x03 | |
210 | ||
211 | #define LOWPAN_IPHC_DAM_BIT 0 | |
212 | /* | |
213 | * LOWPAN_UDP encoding (works together with IPHC) | |
214 | */ | |
215 | #define LOWPAN_NHC_UDP_MASK 0xF8 | |
216 | #define LOWPAN_NHC_UDP_ID 0xF0 | |
217 | #define LOWPAN_NHC_UDP_CHECKSUMC 0x04 | |
218 | #define LOWPAN_NHC_UDP_CHECKSUMI 0x00 | |
219 | ||
3bd5b958 | 220 | #define LOWPAN_NHC_UDP_4BIT_PORT 0xF0B0 |
221 | #define LOWPAN_NHC_UDP_4BIT_MASK 0xFFF0 | |
222 | #define LOWPAN_NHC_UDP_8BIT_PORT 0xF000 | |
223 | #define LOWPAN_NHC_UDP_8BIT_MASK 0xFF00 | |
224 | ||
44331fe2 AS |
225 | /* values for port compression, _with checksum_ ie bit 5 set to 0 */ |
226 | #define LOWPAN_NHC_UDP_CS_P_00 0xF0 /* all inline */ | |
227 | #define LOWPAN_NHC_UDP_CS_P_01 0xF1 /* source 16bit inline, | |
228 | dest = 0xF0 + 8 bit inline */ | |
229 | #define LOWPAN_NHC_UDP_CS_P_10 0xF2 /* source = 0xF0 + 8bit inline, | |
230 | dest = 16 bit inline */ | |
231 | #define LOWPAN_NHC_UDP_CS_P_11 0xF3 /* source & dest = 0xF0B + 4bit inline */ | |
232 | ||
4666669f AA |
233 | static inline bool lowpan_fetch_skb(struct sk_buff *skb, |
234 | void *data, const unsigned int len) | |
235 | { | |
236 | if (unlikely(!pskb_may_pull(skb, len))) | |
237 | return true; | |
238 | ||
239 | skb_copy_from_linear_data(skb, data, len); | |
240 | skb_pull(skb, len); | |
241 | ||
242 | return false; | |
243 | } | |
244 | ||
44331fe2 | 245 | #endif /* __6LOWPAN_H__ */ |